<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div>
            <span>姓名:</span>
            <input type="text" v-model="name" />
        </div>
        <div>
            <span>年龄:</span>
            <input type="number" v-model="age" />
        </div>
        <div>
            <span>性别:</span>
            <select v-model="sex">
                <option value="男" name='sex'>男</option>
                <option value="女" name='sex'>女</option>
            </select>
        </div>
        <div>
            <button @click="add(newId)">添加/修改</button>
        </div>
        <div>
            <table border=" 1" cellpadding="10" cellspacing="0">
                <tr>
                    <th>序号</th>
                    <th>姓名</th>
                    <th>年龄</th>
                    <th>性别</th>
                    <th>操作</th>
                </tr>
                <tr v-for="(item,index)  in arr" :key="item.id">
                    <td>{{index+1}}</td>
                    <td>{{item.name}}</td>
                    <td>{{item.age}}</td>
                    <td>{{item.sex}}</td>
                    <td>
                        <button @click="del(item.id)">删除</button>
                        <button @click="btn(item.id)">编辑</button>
                    </td>
                </tr>
            </table>
        </div>
    </div>
    <script src="./vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                arr: [],
                name: '',
                age: '',
                sex: '',
                newId: 0,
                flag: true
            },
            methods: {
                add(id) {
                    // if ()
                    if (this.flag) {
                        if (this.name && this.age) {
                            this.arr.push({
                                id: +new Date(),
                                name: this.name,
                                age: this.age,
                                sex: this.sex
                            })
                        }
                    } else {
                        this.arr.forEach(item => {
                            if (item.id === id) {
                                item.name = this.name
                                item.age = this.age
                                item.sex = this.sex
                            }
                        })
                    }
                    this.flag = true
                },
                del(id) {
                    return this.arr = this.arr.filter(item => item.id !== id)
                },
                btn(id) {
                    this.flag = false
                    this.arr.forEach((item) => {

                        if (item.id === id) {
                            this.newId = item.id,
                                this.name = item.name,
                                this.age = item.age,
                                this.sex = item.sex
                        }
                    })
                }
            },
        })
    </script>
</body>

</html>